Quote from: Hal9900 on June 26, 2019, 10:27:52 PM

My only concern would then be how permanent the invisible ink is. I know in sunlight it disappears after a week but in the dark it will last indefinitely... so they say. Maybe there a different qualities of invisible ink but I haven't found any.

This a risky move if you don't have first hand experience with the particular invisible ink you are using. Unless you are for some reason opening your safe deposit box weekly to check the ink is still visible, then you probably wouldn't know it had faded until you needed to recover your wallet in an emergency, by which point it is too late.